电子元件与材料
電子元件與材料
전자원건여재료
ELECTRONIC COMPONENTS & MATERIALS
2015年
7期
15-18
,共4页
热电材料%Ca3Co4O9%空间俘获法%固相反应法%热电性能%Seebeck系数
熱電材料%Ca3Co4O9%空間俘穫法%固相反應法%熱電性能%Seebeck繫數
열전재료%Ca3Co4O9%공간부획법%고상반응법%열전성능%Seebeck계수
thermoelectric materials%Ca3Co4O9%steric entrapment synthesis%solid state reaction%thermoelectric properties%Seebeck coefficient
分别采用固相反应法和空间俘获法制备了Ca3Co4O9前驱体,并经冷等静压后常压烧结工艺制备了块体陶瓷样品。利用TG-DSC、XRD、SEM等方法对前驱体进行了表征,同时测试了陶瓷样品的热电性能。结果表明:空间俘获法可获得纯相、晶粒较小的前驱粉体,同时降低了合成温度,而且合成样品的Seebeck系数和功率因子明显高于固相反应法。在976 K获得最大Seebeck系数和功率因子分别为179μV/K、7.5×10–7W/(cm·K2),较固相反应优化60%、16倍;电阻率略有升高。
分彆採用固相反應法和空間俘穫法製備瞭Ca3Co4O9前驅體,併經冷等靜壓後常壓燒結工藝製備瞭塊體陶瓷樣品。利用TG-DSC、XRD、SEM等方法對前驅體進行瞭錶徵,同時測試瞭陶瓷樣品的熱電性能。結果錶明:空間俘穫法可穫得純相、晶粒較小的前驅粉體,同時降低瞭閤成溫度,而且閤成樣品的Seebeck繫數和功率因子明顯高于固相反應法。在976 K穫得最大Seebeck繫數和功率因子分彆為179μV/K、7.5×10–7W/(cm·K2),較固相反應優化60%、16倍;電阻率略有升高。
분별채용고상반응법화공간부획법제비료Ca3Co4O9전구체,병경랭등정압후상압소결공예제비료괴체도자양품。이용TG-DSC、XRD、SEM등방법대전구체진행료표정,동시측시료도자양품적열전성능。결과표명:공간부획법가획득순상、정립교소적전구분체,동시강저료합성온도,이차합성양품적Seebeck계수화공솔인자명현고우고상반응법。재976 K획득최대Seebeck계수화공솔인자분별위179μV/K、7.5×10–7W/(cm·K2),교고상반응우화60%、16배;전조솔략유승고。
Thermoelectric materials Ca3Co4O9 precursor was prepared by solid state reaction and steric entrapment synthesis, combined with normal pressure sintering process to prepare block ceramic samples after cold isostatic pressing. The precursor were investigated by TG-DSC, XRD and SEM. And thermoelectric properties of ceramic samples were characterized. The results show that steric entrapment synthesis can successfully get pure phase, grain fine powder, and decreases synthesized temperature, and sample’s Seebeck coefficient and power factor are obviously higher than those of samples prepared by solid state reaction, which reaches optimal values at 976 K,Smax=179μV/K,PFmax=7.5×10–7 W/(cm·K2), optimizing 60%, 16 times, respectively. The electrical resistivity is slightly increased.